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Circadian preferences in young adults: Psychometric properties and factor structure of the Portuguese version of the Preferences Scale (PS-6)

journal contribution
posted on 06.06.2018, 00:00 by DR Marques, AA Gomes, Vitale Di MiliaVitale Di Milia, MHP de Azevedo
© 2017 Taylor & Francis Group, LLC. Morningness is a trait-like variable which has been extensively studied within chronobiology. Despite the number of existing measures to assess morningness, there is a need for brief instruments that are psychometrically sound to be used in applied settings. Accordingly, the modified version of the Preferences Scale (PS-6) comprises six items and was reported to have adequate reliability and satisfactory validity indicators. In this article, the psychometric properties of the Portuguese version of the PS-6 are reported. A total of 700 students attending medical school were recruited, and this sample was randomly divided into two groups. In the first group (n = 352), we assessed the internal consistency calculations and conducted a principal component analysis of the posited structure. In the second group (n = 348), we conducted a confirmatory factor analysis (CFA) using structural equation modeling. Overall, the results indicated that the PS-6 has adequate reliability (α =.75) and is constituted by two components: (I) preferred cognitive activities timings and (II) preferred sleeping–eating timings, respectively. In conclusion, the Portuguese version of the PS seems suitable for use in research and applied settings such as shift work schedules management. However, the applicability of the PS-6 in other samples and further validity indicators should be both investigated. The use of actigraphy and biological measures should also be collected to enhance the robustness of the PS-6.

Funding

Other

History

Volume

34

Issue

3

Start Page

403

End Page

410

Number of Pages

8

eISSN

1525-6073

ISSN

0742-0528

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Aveiro; b Universidade de Coimbra Faculdade de Medicina; University of Coimbra

Era Eligible

Yes

Journal

Chronobiology International